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At one point, Egon Spengler installed shutters impervious to ectoplasm throughout the Firehouse.[2] When activated, no ghosts could exit the building. It was only known to be used once against the Copycat. By 1997, an elevator lift was added the Firehouse. It extended from the garage bay to the rec room on the second floor, and the third floor.

The basement first of all is where the Containment Unit is. The Laundry Area is located between the Containment Unit and the control panel.[3] The Basement floor is directly above the ceiling of the sewer tunnels below.[4] It also became Egon's study in later years.

The garage is between the doors and Janine's desk. On one side of the room is the Ghostbusting equipment and uniform closets. On the other side are toolboxes, a work bench, and boxes of car parts. Ray and Winston often seen working on the high maintenance Ecto-1 in the garage. Sometimes the floor has oil or other fluids that leaked from Ecto-1 on it.

Janine's desk setup is a typical for a secretary. It has a computer, a typewriter, and a large telephone on it. Next to the phone is a big red button that activates the fire bell, alerting the Ghostbusters that they have a customer or a general call. Behind it are file cabinets that have everything from customer invoices to blueprints to Ghostbusting equipment and act as a wall between Janine's and Peter's desks. All the drawers are rarely locked.

Peter's offices consist of his desk, two chairs in front of the desk (for customers), and an executive chair behind it. His desk has very little paperwork inside it and is more of a foot rest to him. It is loaded with nick-knacks to keep Peter occupied and stuff that he wants to hide from Slimer.

Egon's lab serves as the Ghostbuster's Research and Development division. It also has a state of the art and fully equipped scientific laboratory. Egon is emotionally bonded to his computer which is located inside of the lab. The lab also has a cluster of instruments monitoring the Containment Unit so the Ghostbusters don't need to go downstairs to check on it. Egon is assisted by Ray, Slimer, and/or Winston during his daily experiments. There is also equipment set up to specifically take P.K.E. readings at timed intervals.

What exactly is on the roof changes with each episode. Some items include: a water tower, skylight, one or two TV/CB/Radio antenna, a satellite dish, at least two smokestacks, a stairwell, gutters, a storm drain, landing pad, and unspecified Ghostbusting equipment. At one point, Slimer built his own clubhouse on the roof.[10]